https://llvm.org/bugs/show_bug.cgi?id=23490
Bug ID: 23490
Summary: wrong code at -O1 and higher
Product: libraries
Version: 3.5
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Loop Optimizer
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Created attachment 14313
--> https://llvm.org/bugs/attachment.cgi?id=14313&action=edit
Sources archive
The attached program, which is a part of DNS zone file parser, behaves
differently if compiled with the optimization -O1 or higher. The source code
was generated with Ragel (option -G2) and is relatively large.
Caution: The compilation takes some minutes!
(For the comparison, I have also attached slightly reduced variant of the
parser which is compiled without any problems also with -O1.)
Examples:
OK:
$ clang ./scanner.c -o scanner-O0 -O0 -lm
$ ./scanner-O0
OWNER=00
CLASS=0001
RRTTL=0000012C
RTYPE=0001
RDATA=01020304
== OK ==
Not OK:
$ clang ./scanner.c -o scanner-O1 -O1 -lm
$ ./scanner-O1
== OK ==
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